Landmass elevations

Hi,
just down-loaded a freeware scenery zip file called 'New York and New England 1-Arc Second LOD 10 Terrain Mesh'. Followed all the install instructions and it works great, in the U.S., (+35 fps.) - The area also covers a portion of Canada, (southern Ontario) and some of the airports, lakes and other landmass [in that area] now have the wrong elevation. Short of re-installing FS 9, any suggestions?
Thanks a lot.
just down-loaded a freeware scenery zip file called 'New York and New England 1-Arc Second LOD 10 Terrain Mesh'. Followed all the install instructions and it works great, in the U.S., (+35 fps.) - The area also covers a portion of Canada, (southern Ontario) and some of the airports, lakes and other landmass [in that area] now have the wrong elevation. Short of re-installing FS 9, any suggestions?
Thanks a lot.